<div class="col-md-4">
    <div class="form-group">
        <label class="control-label">{{starttime}}</label>
        <div class="input-group date">
            <input type="datetime" class="form-control" date-time id="studystartdate"ng-click="changeDate1();"
                   ng-model="startTime" view="date" auto-close="true" min-view="date"
                   format="YYYY-MM-DD" readonly>
            <span class="input-group-addon"><i class="fa fa-calendar"></i></span>
                                        <span class="input-group-addon" ng-show="visible1" ng-click="switchvisible1();"><i
                                                class="fa fa-unlock"></i></span>
                                        <span class="input-group-addon" ng-show="!visible1"
                                              ng-click="switchvisible1();"><i class="fa fa-lock"></i></span>
        </div>
    </div>
</div>
<div class="col-md-4">
    <div class="form-group">
        <label class="control-label">{{endtime}}</label>
        <div class="input-group date">
            <input type="datetime" class="form-control" date-time id="studyenddate" ng-click="changeDate2()"
                   ng-model="endTime" view="date" auto-close="true" min-view="date"
                   format="YYYY-MM-DD" readonly>
            <span class="input-group-addon"><i class="fa fa-calendar"></i></span>
                                        <span class="input-group-addon" ng-show="visible2" ng-click="switchvisible2();"><i
                                                class="fa fa-unlock"></i></span>
                                        <span class="input-group-addon" ng-show="!visible2"
                                              ng-click="switchvisible2();"><i class="fa fa-lock"></i></span>
        </div>
    </div>
</div>